Version 5.1.1

Include .NET Framework 4.5.2 for legacy project. Updated README.md

.NET 4.8, .NET 6.0

Updated and release for .NET Framework 4.8 and .NET 6.0

UPDATE

TcpClient: Add DataReceived event. Listen to DataAvailable flag with thread.
TcpServer: Fixed Connected flag not set properly.

Initial Release

V-01-00-00

Update README.md